Have a 2004 isuzu rodeo with the same problem as the person with this same question but has not yet recieved a reply. changed coils,plugs,catalytic converter and still come uo with misfire on #4 cyl,Po 340,1350,and it runs very good even after light comes on. Could it be an injector or other sensor melfunctionthat may be going on here? If the dealer and other auto sites cant seem to give me an answer do I have a better chance playing the lottery?